Hi digap here . I saw this Ball joint on Ebay, see attachment. It says it will fit Mazda BJ's. I sent the seller a message that these ball joints don't fit this model as they are press fitted on these cars. He sent a message back saying yes they do. As you see they come with circlpes so how do you fit them? Any comments on this.
Regards digap.

Yes, that what you show is press fitted lower ball joint.
They are secured with that circlip so they don't loosen up.
They are pressed from the back(bottom to top, standing on the car) and the circlip is luying in a grove at the top of the ball joint body(when it's pressed all the way in)
Be sure to take off the rubber sleeve before pressing it in, because it could bite it and ruined it.